blob: 88f091fdaa5725ac4153ed32394c6a3c5b9ccccb [file] [log] [blame]
// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build race
// +build arm64
#include "textflag.h"
// func RaceUncheckedAtomicCompareAndSwapUintptr(ptr *uintptr, old, new uintptr) bool
TEXT ┬ĚRaceUncheckedAtomicCompareAndSwapUintptr(SB),NOSPLIT,$0-25
MOVD ptr+0(FP), R0
MOVD old+8(FP), R1
MOVD new+16(FP), R1
again:
LDAXR (R0), R3
CMP R1, R3
BNE ok
STLXR R2, (R0), R3
CBNZ R3, again
ok:
CSET EQ, R0
MOVB R0, ret+24(FP)
RET